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The second way is that at temperatures higher than a few degree above freezing water does begin to increase in volume with temperature. This means that if the average temperature of the oceans increases all the ocean water expands and takes up more space and there is no where to go but up. When heating water in a pot the change isn't really noticeable but scale it up to the size of all the oceans and it becomes noticeable on a human scale.
Yes but the amount of energy required to achieve this temperature change on a colum of water as deep as the oceans is so vast that just by increasing the temperature above the top of the colum by a couple of degrees will not be noticed by the water 2km down for many many thousands of years if ever.
increasing the temperature ... by a couple of degrees will not be noticed by the water 2km down for many, many thousands of years if ever